990662331 has 4 divisors (see below), whose sum is σ = 1320883112. Its totient is φ = 660441552.

The previous prime is 990662327. The next prime is 990662339. The reversal of 990662331 is 133266099.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 990662331 - 2² = 990662327 is a prime.

It is a super-2 number, since 2×990662331² = 1962823708124707122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 990662331.

It is not an unprimeable number, because it can be changed into a prime (990662339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165110386 + ... + 165110391.

It is an arithmetic number, because the mean of its divisors is an integer number (330220778).

Almost surely, 2^990662331 is an apocalyptic number.

990662331 is a deficient number, since it is larger than the sum of its proper divisors (330220781).

990662331 is a wasteful number, since it uses less digits than its factorization.

990662331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330220780.

The product of its (nonzero) digits is 52488, while the sum is 39.

The square root of 990662331 is about 31474.7888158126. The cubic root of 990662331 is about 996.8777050873.

The spelling of 990662331 in words is "nine hundred ninety million, six hundred sixty-two thousand, three hundred thirty-one".